Taking the “minus” out of Integer Subtraction Taking the “minus” out of subtraction

IWBAT subtract integers. Today’s Objective IWBAT subtract integers.

But first, let’s review!

The Integer Song Same signs add and keep Different signs subtract Take the sign of the higher #, Then you’ll be exact!

Adding Integers … In Context! If it were 110 degrees outside on Monday morning, and then got 34 more degrees hotter by noon, what would the new temperature be? 110 + 34 144 degrees Man, it’s hot!!!

Adding Integers … In Context If it were -5 degrees outside on Monday morning and then got 7 degrees hotter by noon, what would the new temperature be? -5 + 7 Brrrrr … it’s cold out there! 2 degrees

Adding Integers … In Context Once upon a time, in a far away land of Minnesota … If it were -15 degrees outside on Monday morning and then got 17 more degrees colder by noon, what would the new temperature be? -15 + -17 -32 degrees

So what if I see subtraction? I've got just 3 simple letters for you... K C C

But what is KCC?? K eep C hange C hange

Using the KCC subtraction rewritten K C C Any ______________ problem can be ____________ using the ___ ___ ___. rewritten K C C Keep Change Change 5 - 7 = 7 + - (In this case) CHANGE the “positive 7” to a “negative 7.” KEEP the 5. Don’t do anything to it! CHANGE the “-” sign to an “+” sign.

KCC Solve the following problems using the KCC method. 5 – 12 = 10 – 13 = 14 – 22 = 32 – 33 = -5 – 12 = -7 – 11 = -4 – 12 = -3 – 24 =

EXIT TICKET Now try these out. Remember, we still use KCC whenever we see subtraction. 5 – (-12) = 10 – (-13) = 14 – (-22) = 32 – (-33) = -5 – (-12) = -7 – (-11) = -4 – (-12) = -3 – (-24) =